R50/R53 :: Hatch Talk (2002-2006) Cooper (R50) and Cooper S (R53) hatchback discussion.

R50/53 2006 MCS - Can't bleed slave cylinder

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Old May 27, 2019 | 10:42 AM
  #1  
r53-06m6's Avatar
r53-06m6
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From: Distant DC & Richmond exurbs of Virginia
2006 MCS - Can't bleed slave cylinder

I purchased an FTE slave cylinder and went to install it.

I used the procedure here and purchased the tool to compress the slave instead of making it.


So I went with the two person method. I had the person press the clutch pedal and then I would tighten the plastic bleeder. Everything seemed to be going ok until the line blew off and I ended up with the brake fluid in my face. I guess I didn't have the seal in there down enough or whatever.

I guess the fluid also got really low in the reservoir (brakes are still tight). I was able to get the slave secured again, but now fluid wants to trickle out instead of stream out.

Even if I remove the line to the slave, it just trickles out.

Doesn't matter how much I pump or add fluid to the top.

I couldn't get any info on which power bleeder to use from a vendor I contacted here, so I ended up using my harbor freight A/C vacuum pump. Even with that running, it won't pull fluid any faster than it will drip.

Why won't fluid flow now whereas before it would flow at a fast pencil lead stream?

Thanks.
 
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Old May 27, 2019 | 12:05 PM
  #2  
r53-06m6's Avatar
r53-06m6
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From: Distant DC & Richmond exurbs of Virginia
Update, I mounted the slave just to see what would happen if I ignored the problem. There is no pedal pressure whatsoever! The pedal has to be pulled up each and every time.

Help!
 
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Old May 27, 2019 | 12:57 PM
  #3  
Blue R50's Avatar
Blue R50
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From: Tampa Bay Florida
I hate to say this, given where the master cylinder is, but you may have a bad seal in the master. I fought a new slave cylinder in my Nissan truck for hours trying to get it to bleed. It did the same thing yours is doing. I eventually also changed the master and then it bled and all was right with the world...except for the $80 I spent to buy the master and slave cylinders...
 
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Old May 27, 2019 | 02:16 PM
  #4  
r53-06m6's Avatar
r53-06m6
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From: Distant DC & Richmond exurbs of Virginia
Originally Posted by Blue R50
I hate to say this, given where the master cylinder is, but you may have a bad seal in the master. I fought a new slave cylinder in my Nissan truck for hours trying to get it to bleed. It did the same thing yours is doing. I eventually also changed the master and then it bled and all was right with the world...except for the $80 I spent to buy the master and slave cylinders...
Thanks for the fast response. I lucked out. Here is what I did. I put took the slave back off and started over.

Compressed it. Then I hit the pedal about 200 times. Opened the slave and out came a stream of fluid. I let it gravity bleed which worked suprisingly well and quick. Did the bleeding with just the front end off the ground. Closed the bleeder screw. Pumped the pedal about 400 to 500 times. Didn't feel perfect. Started vehicle and kept pumping. Went into gears fine. Kept pumping. Now I wedged a skateboard between the seat bottom and pedal and will let it sit for 24 hours or so based upon previous posts even though it is fine already.
 
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Old May 29, 2019 | 12:11 PM
  #5  
r53-06m6's Avatar
r53-06m6
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So I let it sit overnight again and now it's hard to get into 1st gear. Disengagement is right off the floor.

I wonder if the master is also bad. Everything is fine if I pump the pedal several times before putting it in gear.
 
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Old May 29, 2019 | 12:26 PM
  #6  
BlwnAway's Avatar
BlwnAway
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From: Arnold, MO.
If it works when you pull it, then there's still air in the system.

I would start from scratch, with the help of a power bleeder.
Also make sure to pay attention to the height and level orientation of the car, the left front corner really does need to be higher in order to get all the air out of the small passages in the slave itself.
Don't be surprised if you go through 2 small bottles of fluid in the process, sometimes it takes a lot until it's air free.
 
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